How to Control Genesis Framework Responsiveness?

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This is my first post, so I apologize if I am posting in the wrong place, or if my questions are not fit for the forum.

I have bought the Genesis Framework theme and I have made a child theme. The problem I am having is understanding how the responsiveness works. I am somewhat new to html and css, but I have used responsive frameworks in the past such as the Skeleton framework from http://www.getskeleton.com/.

With the Skeleton framework, I can specify how many columns I want my content to take up, so it's very easy for me to create layouts for my content, and the responsive part works right off the bat. If I have two columns side-by-side, once I shrink my browser, the column on the right will go automatically under the left one. I don't want to waste my time explaining how this works, and I don't want to bore the people who already understand this, so I'll get to the point.

How do I do the same thing with the Genesis framework? I am having a hard time understanding how I can control the responsiveness of my website, powered by WordPress of course. I have tried to just float items next to each other for my layout, but the problem is that it's too messy; it's unpredictable. Part of that problem is that the Genesis is fluid, so that it's always changing even if you shrink the browser just a few pixels. Is there a way to change the framework so it works more like the Skeleton framework, in that it is not fluid, but has a few media queries that specify exact pixel widths. I would rather have a website that responds depending on what pixel width range I'm in, instead of it always being responsive at virtual every browser size. I am wondering if there is a modification for the Genesis Framework to allow me to do this? If not, I would love to know how to make the fluid responsiveness more predictable and more controllable.